Mercedes W204 M274 Automatic Gearbox Oil Cooler Pipe Hose Line Left A2042705196

Mercedes W204 M274 Automatic Transmission Oil Cooler Hose Left is a specialized component from the Oil Coolers and Hoses category, designed for operation within the automatic transmission lubrication system. Precise fitment to the Mercedes construction and dedicated left-side placement ensure stable oil flow and proper cooperation with the cooler, which translates to safe operating conditions for the gearbox.

Specifications and technical data

• SKU: A2042705196
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2042705196
• Substitutable numbers: A2042705196, A 204 270 51 96
• Location on the vehicle: Left
• Gearbox type: Automatic
• Category: Oil Coolers & Lines

Purpose and Function in the Oil Cooling System

The left oil cooler hose for the automatic transmission in the Mercedes W204 with the M274 engine is responsible for the controlled flow of oil between the gearbox and the heat exchanger. A correctly selected hose helps maintain a stable operating temperature of the oil, reducing the risk of overheating, degradation of lubrication quality, and accelerated wear of internal transmission components.

This element is particularly important in vehicles operated in urban conditions and under higher loads, where the automatic transmission generates elevated temperatures. The use of the correct hose minimizes pressure losses in the system, supports uniform cooling, and helps maintain stable transmission operation across the full load range.

Compatibility with Automatic Transmission

The hose has been developed for cooperation with an automatic transmission, meaning it has an appropriately selected inner diameter, geometry, and connection ends. Thanks to this, it ensures:

• correct direction of oil flow in the cooling circuit,
• stable connection to the oil cooler and the gearbox housing,
• adequate resistance to operating pressure and transmission oil temperature.

Left-side placement facilitates proper routing of the hose in the engine bay, maintaining factory mounting points and avoiding collisions with other components. This is important both from a safety perspective and for subsequent service maintenance.

Application in the Oil Cooling System

In systems where the transmission oil is cooled via a dedicated cooler, the hose acts as a transport channel for the working medium. The correct selection of an element from the Oil Coolers and Hoses category influences:

• maintaining the appropriate oil temperature across a wide range of driving conditions,
• stable operation of the automatic transmission during frequent gear changes,
• reducing the risk of deposit formation and oil degradation caused by overheating.

For Mercedes W204 vehicles with the M274 engine, the proper condition of the oil cooling hoses is crucial not only for comfortable gear shifting but also for the long-term durability of the entire powertrain.

Product Characteristics and Application Benefits

The offered hose is an element intended for installation on the left side of the vehicle, allowing for the preservation of the original oil line routing in the Mercedes W204. Thanks to its design adapted for automatic transmissions, the hose ensures:

• appropriate rigidity and routing of the oil line in the engine bay,
• compatibility with the factory transmission oil cooling system,
• possibility of use as a replacement for the factory-fitted element in the vehicle.

This solution is dedicated to users who want to restore the correct operation of the transmission oil cooling system after damage or wear of the original hose, while maintaining operating parameters close to factory specifications.

Condition and Application in Vehicle Service

The hose comes from the Mercedes offering and is a used part, making it an attractive cost alternative to new parts while maintaining proper fitment for the specific vehicle configuration. It can be used for both standard replacement of a damaged hose and for comprehensive servicing of the automatic transmission oil cooling system.

If you are planning service for your Mercedes' transmission oil cooling system and are considering used parts, it is worth reading the guide describing the impact of temperature on the cooling system and the potential savings when selecting components – details can be found in the article Summer Heat vs. Cooling System: Used Coolers and Fans Guarantee Savings.

If you need other components related to the transmission oil circuit in your Mercedes, such as additional hoses, pipes, or components cooperating with the heat exchanger, check the available parts in the Mercedes Oil Coolers and Hoses category.